package com.bite.demo.utils;

import io.jsonwebtoken.*;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.Assert;

import java.security.Key;
import java.util.Date;
import java.util.Map;

@Slf4j
public class JwtUtils {
    private static long expiration =600*60*1000;//30分钟过期
    private static String secretString = "rkFbhl8tfnnKOC/rVQCHc1MTOUTSAbwXWLdZ5t3wsJs";
    private static Key key = Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretString));

    /**
     *
     * @param claims 生成令牌
     * @return
     */
    public static String genJwt(Map<String,Object> claims) {
        return Jwts.builder()
                .setClaims(claims)
                .setExpiration(new Date(System.currentTimeMillis()+expiration))
                .signWith(key)
                .compact();
    }

    /**
     *
     * @param token 校验令牌
     * @return
     */
    public static Claims verify(String token) {
        JwtParser build = Jwts.parserBuilder().setSigningKey(key).build();
        Claims claims = null;
        try {
            claims= build.parseClaimsJws(token).getBody();
        }catch (ExpiredJwtException e) {
            log.error("token校验失败，token："+token);
        }
        catch (Exception e) {
            log.error("token过期，校验失败，token："+token);
        }
        return claims;
    }
    public static Integer getUserIdFromToken(String token) {
        Claims claims = verify(token);
        Assert.notNull(claims,"token不合法");
        Integer userId = (Integer) claims.get("id");
        return  userId;
    }
}
